# Sandwich estimator 2
# This function is internal and not to be called by the user
sandwich2.f <- function(Y, g1, g2)
Y1 <- na.omit(Y[g1])
Y2 <- na.omit(Y[g2])
return(sum(sapply(Y2, function(x) sum(1*(Y1 < x) + 0.5*(Y1 == x)))^2))
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